Printing-plate



E- E, NOVUTNY.

PRINTING PLATE.

APPLICATION ULEB DEc.11, 1919 L 1:8. Patnted May l, 192L l 7122 @37161 71551 wom/45%@ i;

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Nairn n, NovorrNY,Y or LOGAN, PENNSYLVANIA, AssIeNon'ro -JOHNA sroeintrirl 1 ,sro'kns or PHILADELPHIA, PENNSYLVANIA t Leraars..

'ofLogam in the county of Philadelphia and State `of Pennsylvania, have invented certain new and useful Improvements in Printing-Plates, of which the following is a v specification.

This invention relates to Acertain novel and useful improvements in printing plates, and has' particular application to printing plates whichare composed in whole or in as bakelite', condensite or the like, or in fact` of any other snythetic resin possessing cha'rpart of phenolic condensation products such the making "of such plates',- for instance the Y capability of hardening and setting to an A infusible form during or after the plate molding operation.'

EAS is well known, these phenolic condensa- .tion, products are capableof reduction by i heat to a plasticstate, and of subsequently hardening and setting underv heat and pressure,'.or'heat, pressure and cooling to a hard vpermanent state.y I have used such material to great `advantage in making durable and high grade printing plates, especially where l have made thelbody of the plate of fiber or fiber board sheets impregnated with the phenolic condensation product.

However it vsometimeshappens that a plate n willbe produced which will be found to be i 3 buckled or warped so as t'opractically render .'35v

it useless for press work. -llsually the production of such buckled or warped plates 4is due to carelessness on the part ofthe operator in charge of the molding press on which the vplates are made. lt is very desirable to save these buckled or warped platesand to rem- 4edythe defect so that such plates maybe used for printin instead of beingdiscarded. I i @ne 'of the principal objects of the invention therefore is the production of a molded printing plate wherein warping or buckling of the 'late will be prevented or, ifwarping or bue ling exists in lthe plate, such defect ma vbe eleminated.l It isalso fm Vpurpose to provide a printing plate whic will embrace the desired features of simplicity, accuracy and durability, and *which*l may be manufactured and marketed at a relatively low cost. v

All/Vith the above recited objects and others of a similar nature in View my invention e rniNrING-PLATE.,

Specification of Letters Patent. I

naeentea tray ic, 192i.

I Application filed December 11, 1919. Serial Noi.' 344,225.

consists in theimproved printing plate and 'Y in the method set forth in and falling within the scop'eofthe appended claims:

In the accompanying drawing: Figure l, is a view in cross sectionl of a phenolic, buckled. Fig. 2, is a similar view of a backing section or slab which is to be united with the back of the warped plate to eliminate the defect.- y Fig. 3., conventionally illustrates the platens of a press and showing the step of applyingfthe backing to the warped plate.

lig. 4, Vis across sectional View showing the corrected plate. A

Fig. 5, is across sectional view. and illusprinting plate 4which has warped or trating a plate backed up to avoidwarpingk I and then mounted upon a wooden base block. In making a printing pla-tell may proceed i as follows x lselect afsheet of stock ofsuitable size, and i which may be eitherv made entirely of fa phenolic condensation product, or of such product in icombinat'on with other materials such as fiber. Y e e v The preferred way of preparing this stock "is to impregnate asheet of `fiber board with a -certain amountof phenolic. material and,V

then place this impregnated sheet between the fiat platens of the press and apply heat and pressure to a degree sufficient to bring some ofthe phenolic material to the face of the fiber board sheetwhere it is partially material, which has been saturated with a composed of bond paper or other absorbent y low percentage phenolic solution or varnish,

and then heated and dried until the phenolic material therein has assumed an infusible form. The resultfwill 'bethat this paper vsheet so treated' willretain its rough, stratilied characteristics and will be rendered nonabsorbent .by the phenolic material, so that the fiber structure of the paper will not disintegrate or swell whenwet by the cleaning. solutions commonly used on presses and printing equipment. This paper-backed sheet is then placed face down cn the printing plate matrix in asuitably heatedpress vand the plate is molded against the matrix in the usual way. The molded-plate, when completed, may through carelessness on the part of the operator, or because of some peculiar'- ity o r deficiency in the material, or for some other reason, appear warped or buckled as' indicated; forexample in l of the drawing wherein the numeral 1 indicates the phenolic plate proper and -2 is the phenolicy treated sheet of paperor .the like which' has been applied to the back of thepla-te l and which, of course, has been'causedto adhere. thereto during -the molding operation by',

" the phenolic material at the. back surface as describedA for theplate blank, to form.

of the plate, this material when soft vbeing exceedingly sticky in its nature, but subsef quently, of course, hardening to a set form.

To eliminatethe buckling-v orwarping in f fthe plate, as illustrated in'Fig. 1, I then proceed as follows: i y

Upon the top surface of the paperbacking 2 of the plate 1,-I apply a coating of a suitable cement, preferably-water#'glass. I- then impose upon this cement coated backing 2, a backing sheet or layer 4 shownin phenolicmaterial and preliminarily molded,

a slab having flat smooth polished .'face's.

The backing slab 4 and the platethus assembled are placed in a fiat pressand subjected to slight pressure, without heating,

-for a short period of time, vsay one 'half' minute., yuntil the'plate and the back v4 are firmly united. As the plate bowing toits inherent structureV can yield or spring i slightly it will be flattened in the press at the time of theapplication of the backing slab, and when removed from the press the backingr slab will support the plate '1: and

maintain the same .in a .substantially fiat condition. The plate will not subsequently warp because thebacking Aslab or, sheet has been set to a permanent flat condition and as the plate l has been pressed and cemented into a firm unionwith the backing slab, the latter of course will prevent the'subsequent buckling occur it will not interfere with the proper use of the plate onthe press as the press hooks wiil hold the plate securely and Y properly on the press'bed, vthe plate being relatively thin and capableof slight flexing to press it into place on-'the bed ofthe press beneaththe hooks. If desired, ofcourse, the

' coating of water-glass cement might be applied to the contacting face of, thebacking slab 4 instead of to the absorbent paper 2 at the'back of the plate 1.

Furthermore, I prefer `to apply to ythe backof the backing slab 4 a -sheet/ of paper, such as bond paper or the like, shown-at 5, which has also been treated with phenolic material like'the sheet 2, When desired` this wooden base .block lis very advantageous, vas it dispenses with the necessity of drillingso that'the plate is ready for use in a short time. `Furthermore, the interposed phenolic the plate and nailing the same/to the wood base. In the 'electrotyping trade itis possible to fasten plate Ato Wooden base blocks 'andthe like-by'using a nailing machine whereas these hard, brittle phenolic plates require drilling and vhand nailingbecause of the impracticability of making nails driven by a nailing machine coincide properly with. holespreviously drilled through thefphenolic plate.

. My herein described method of cementing or gluing the elements together,. utiliz ing 'i the phenolic treated :paper sheets, permits the glue or cement to absorb and set rapidly treated sheets constitute separating mediums in the sense that should a stereotyper desire to unmount it upon a standard metal base, all that is necessary is topry the plate loose from the block and the lpaper will split .along its center linedisplaying a clean, uniform dimension.I This obviates the danger of removing or unmounting nailed phenolic plates fromwooden blocks, as there is frequently va possibility of breaking off' a portion ofthe brittle printing plate through carelessness 1 or accident. However,V when the plate is vcemented to the block asjust described, it.

can be quicklyremoved wthoutany" Such danger,

While I have herein-shown and descrilxidV l l certain preferred embodiments of my inf vention, wish it to be understood that l d o not limit myself to all the details set forth, as modification and variation maybe l madewithout departing from the spirit-of A i the invention or 'exceedingthe scope of the warping of the plate.v Should any slight n portion, a backing slab therefor, and a'layer y of phenolic treated fibrous material and aV layer of 'cement interposed between the printing .portion and the backing slab and`12"V uniting the two in a manner t0 prevent the warping orbuckling of the printing portion.

2. A printing plate c( mprising a printingv I portion, a backing slab therefor, and a layer of fibrous material, and a layer-of glue-like cement interposed between the printing por-` tion and the backing slabf and uniting the two in a manner to prevent the warping ori buckling of the printing portion.

3. A printing plate comprising a printing 13o portion,'a backing slab therefor, and a layer of paper and Water-glass cement interposed between the printing portion and the backing slab and uniting such portion and slabs.

4. A printing plate ycomprising a printing portion having phenolic material as a con stituent thereof, a fibrous sheet secured to the back of the printing portion, a backing slab for the printing portion, and a suitable cement uniting the backing slab with the fibrous sheet at the back of the printing portion.

5. A printing plate comprising a printing portion including phenolic material, a phenolic treated sheet secured to the back of the printing portion, a backing slab containing phenolic material, and a glue-like cement uniting the backing slab with the phenolic treated sheet at the back of the printing portion.

6. A printing plate comprising a printing portion, a backing slab cemented to the back of the printing portion to prevent the buckling of the latter, said backing slab comprising a fibrous body having a hard and set synthetic resinous material incorporated therein, and a base block fastened to the back of the backing slab.

7. A printing plate comprising a printing portion, a backing therefor comprising a ber sheet impregnated With a hard and set phenolic material to form the backing slab, and means for cementing the printing por.- tion to the backing slab in a manner to prevent the buckling of the printing portion.

8. The herein described method Which comprises applying a fibrous sheet to the back portion of a printing plate, providing 'a backing slab, and cementing the backing slab to the fibrous sheet under pressure, applying a second fibrous sheet to the back'face of the backing slab, and 'then uniting the parts under pressure.

9. The herein described method which comprises applying a phenolic treated sheet to the back portion of a printing plate, providing a backing slab, cementing the backing slab to the phenolic treated sheet under pressure, applying a second phenolic treated sheet to the back of the backing slab, and then cementing said backing slab to a base block. j

Signed at New York city in the county of New York and .State of New York, this 5th day of December, A. D. 1919.

Eli/.LTL E. NGVOTNY. 

